High-frequency-signaling system



1,645,95 Oct., 18, 1927. H KEYL 6 HIGH FREQUENCY SIGNALING SYSTEM FiledAp ril 14. 1924 Patented (M. 18, 1927.

UNiTED STATES teases-e PATENT @FFPCE.

HANS sa s, or BERLIN, GERMANY.

HIGH-FIRE QUENCY-SIGNALING SYSTEM.

Application filed April l l, 1924, Serial No. 706,532, and in GermanyApril 13, 1923.

The invention relates to high-frequent} signaling s'ystemsand it hasparticular relation to se-lective'calling of different stations of suchsystems. I I

According to the invention, the transmit' ting and the receivingstations are provided with synchronous contact making devices.

The contact-making devices of the receiving stations successively placedifferent stations in a condition to respond to the high-frequencysignals of the transmitting station while the contact-making device atthe transmitting station so controls the eriod of time .duringwhich thehighrequency signals are sent'out that signals are transmitted only whenthe station that is to be called is in receiving condition.

The synchronous contact-making devices are preferably of ,the rotarytype'and are arranged to make a single complete revolution for eachcall, each of the receiving sta tions being placed in receivin'gcondition during a part of the revolution. Such arrangement permitsselective calling of a large number of substations by means ofvery-simple dallingcir'cuits.

In the accompanying drawings,

,Figure 1 is a diagrammatic viewof the circuits in the transmitting andreceiving stations of acsignaling system embodying my invention;

F ig; 2 is a side view of the releasing mechanism used in thesynchronous contactmaking'devices; and i .Fig. 3 is a view similar toFig. Iof a modification 'of my invention. v

Referring to Fig. 1, a transmitting station S comprises a high-frequencyenergy trans mitter E which isput into operation by means of a switch. othat'closes the circuit of the wires 1 and 2 leading from thetransmitter E to a synchronous contact-making device C. hecontact-making device comprises a plurality of circularly disposed,

fixed contact segments which are arranged to be successively en-' gagedby a rotarybrush B that is mounted upon a disc P which is adapted to berotated in clockwise direction at aconstant speed, by aclock work orother motor, not shown on the drawing. I,

The disc P is normally-prevented from rotation and the brush B. ismaintained in theinitial position,.shown in the drawing,

by meansjof a latchA abutting against a suitable projection orstopof-the .disc.

.one of the other contact segments K,,

In the initial position, the brush engages the disc-release contactsegment K which is connected to the conductor 1 of the trans-.

mitter, the second transmitter conductor 2 leading through the switch11,, to the rotary brush B. The other contact segments K,, .K,, etc.,are station-call segments and correspond to the various substations thatare to be selectively called: Either one of said segments may be usedto,complete the transmitter circuit, by means of keys T1; T etc.,connect1ng the corresponding segments to the conductor 1 leading fromthe transmitter to the disc-release segment K,"the circuit beingestablished only while the rotary brush engages the correspondingsegment.

The latch A is lifted by means of a latch magnet M which is energizedfrom a source of energy F through a switch u owhich is operated jointlywiththe transmitter-energizing switch u both switches being closed uponproceeding to call, .by lifting the receiver in the transmittingstation, for in stance- Each receiving station is provided with asuitable receiving circuit, indicated schematically by. atuned inputoscillating circuit L- connected between the filament and grid of athree-electrode tube V. The output fcir- ;cuit of the tube operatesasuitablerelay or galvanometerG the output circuit being additionallycontrolled by a synchronous contact-making device C comprising fixedcontact segments K, K,', K,', etc., anda cooperating brush B that ismounted upon a synchronously rotated disc P; similar to the contactdevice C of the transmitting sta tion. As in the transmitting station,the

brush B of each receiving station is normally held in an initial restposition, in en-.

gagementwith' the disc-release contact segment against a stop G of therotary disc P.

The disc-release contactsegment K of each receiving station is shownconnected through the galvanometer Gr to the plate of the tube V, whilethe brush leads through a plate battery H. to the tube filament. Inaddition, each of the receiving stations 7 etc., connected to thegalvanometer lead, a different segment, K,, K, being connected at thedifferent StiltlOHS, respectively. At the station R,,'shown in:the'drawin the galvanometer is connected to contact at another stationto contact K and so forth.

K, by means of a latch A abutting The relay or galvanometer G; at eachreceiving station operates through a battery F, the latch lifting magnetM and a signaling device, such as a bell M the circuit through thelatter including" an auxiliary switch Z which is closed by a cam N onthe rotary disc P only while the brush B engages the station-callcontact segment K, which is connected in the galvanometer cir- V cuit ofthe respective station.

release contact, segment of the respective station.

A simple construction for securing such, operation of the contact deviceis shown in Fig. 2. The magnetically actuated latch A is attached to aspring f and has two d1sc catch members Q, and Q which are side- Howeverwise ofl'set with respect to each other, the

catch member Q, being also somewhat in front of the other member Q WVhenthe latch is released, one catch member Q, engages the disc stop G andholds the brush. When the latch is attracted by the magnet, the catch Qreleases the stop G of the disc and the brush rotates until it isstopped after one revolution either by catch Q1, or by catch Q,depending on whether the magnet is already deenergize'd or not. If themagnet is still energized, the disc is stopped first by the second catchQ somewhat before it reaches its ultimate rest position in which thebrush is in engagement with the disc-release segment. After the magnetthen becomes deenergized, the second catch Q releases the disc for aslight additional motion until it is finally stopped by the main catchQ, in the position shown in Fig. 1. The brush will thus carry out only asingle rotation each. time the latch magnetis energized and will notrotate again until after the magnet has again become deenergized. Theoperation of the system is as follows: When the transmitting station Sdesires to call one of the receiving stations, for instance, R,, the keyT is pressed down and the switch u,u, is closed at the transmittingstation, by lifting the receiver, for instance, thereby energizing thelatch magnet M and completing the connection from the high-frequencytransmitter to the synchronous contactor C. The magnet lifts the latchA, releasing the rotary disc P and the brush B for a rotation duringwhich the brush B successively engages the several segments K K of thecontactor device C.

at the ,moment when the actuating switch u u, has been closed, the brushwas in engagement with the disc-release contact so cut K, thuscompleting the circuit 12 0 the high-frequency transmitting deceiving'stations, actuate the receiving tubes Y, and since the output circuitsin said stations are closed through the brushes B which are inengagement with the contact segments K, the contact and the galvanometerdevice Gr are actuated, energizing the latch magnets M, and releasinnthe rotary contacting devices C for a rotation practically simultaneouswith the rotation of the contactor device in the sending station.

The rotary brushes B-B in the sending and receiving stations arearranged to rotate substantially synchronouslyso that the brushes slidepast the corresponding segments at the sending and receiving stationspractically simultaneously and come to a rest in all stations after asingle rotation at practically the same time. After the brush B at thesending station has left the engagement with the disc-release contactsegment K, the c1rcuit of the high-frequency transmitter 1s openedandthe transmission of high fr uency energy is stop e'd. In the courseof tie further rotation of the brush B at the sending station, the brushsuccessively engages the contact segments K K and K but since only thekey T leading to the coritact segment K corresponding to the stationthat is to be called is closed, high freuency energy will be transmittedduring t e period of time while the brush B ongages the contact segmentK. At the same time, however, as the brush B 1n the sending station isin engagement with the contact segment K the brush B in the rece vingstation R is in engagement with the contact segment K completing theplate circu t of the receiving tube in the station that is to be calledso-as to actuate the galvanometer G.. Since at the same time the cam Nhas closed the auxiliary switch Z leading to the signaling or callingdevice M the galvanometer which is energized by the incom ng wavescompletes the circuit from the battery F to the signaling device M andactuates the same.

Since in the other receiving stations the other segments K,,' K arearranged in the plate circuits of thereceiving tubes V, these stationswill not respond by reason of the fact that no energy itsbeingtransmitted from the sending station at the time that the brushesin the respective stations engage the corresponding contact segments.

The synchronously rotating brushes complate the revolution and arestopped b the atches AA' in the manner described ereinbefore.

The signaling device M, at the receiving station, which is showndiagrammatically in the form of a bell is, of course, intended onlyearners to illustrate the idea underlying the arrangevment foretl'ecting selective'callingof the several stations and it isunderstoo'dthat other suitable means might nstead be used forestablishing communication with the' tactor device C being connected inalocalcircuit which is closed or opened by the action of thegalvanometer. The brush is normally held in engagement with thedisc-release contact' segment Kas in the case of the contactor device ofthe receiving stations shown in Fig. 1. Upon the initial reception ofhigh frequency energy, the galvanometer is actuated, energizing throughthe disc-release contact segment ;K' and brush- B the relay R, which inturn, energizes the latch magnet M, setting the brush in rotation. Asthe brush rotates and slides past the contact segment K, of the stationthat is to be called, the galvanoineter is again actuated by thereceived high frequency oscillat ons, energizing relay R which in turncloses the circuit'from the battery F through the signaling device M theauxiliary switch Z being now closed by the protruding cam N of therotary disc as in the case of the arrangemen t shown in Fig. 1.

The foregoingarrangements and circuits are not limited to the particularapplications described hereinbefore but I desire that the appendedclaims be construed to" cover broadly any arrangement whereinsynchronous devices are provided in a plurality of stations, 50 as to beset in motion upon the reception of an initial impulse and control; intheir further operation the relative periods during which the severalreceiving stat-ions'are in a condition to respond to signals'transmitted from the sending station.

I claim as iny invention:

1. In a high-frequency signaling system, a transmitting station havingmeans for transmitting high-frequency energy, a plurality of receivingstation'shaving -means for receiving said energy, signaling meansoperated by said receiving means, and synchronous control devices ineach of said stationsfor selectively calling any one of said stationsfrom said transmitting station.

2. The combination with ii-station having means for transmittinghigh-frequency en; ergy, a. plurality of stations ha means for.receivingsaid energy. and

means operated by said receiving means, of means for selectively callingone of the receiving stations from said transmitting station comprisingsynchronous devices in each of said stations arranged to perform a cycleof operations upon each initiation of energy transmission, the operationof said synchronous devices controlling the relative periods of energytransmission of said transmitting station and the'operative connectionsof the signaling means in said receiving stations.

3. In a high-frequency signalingsystem, a transmitting station havingmeans for transmitting liigh-frequencyenergy, a phi-i rality ofreceiving stations having means for receiving said energy, signalingmeans operated by said receiving means, means for selectively callingone of the receiving stations from said transmitting station comprisingcontrol devices in all of said stations arranged tosynchronouslycarry-out a cycle, of operations -in response to an,initiation ofi energy transmission from said transmitting station, saiddevices successively placing the signaling devices of the severalstations in operative condition during different periods of said cycle,and means cooperating with the control device in said transmittingstations for restricting the period of energy transmission totheinterval of the cycle during which the station that is to becalled-is in operative condition.

4. An arrangement according to .claim 2 characterized by thefact thatthe synchronous devices in each of said stations carry ou t a completecycle of operations at each initiation of energy transmissionand'automatically ret-urnto the initial position.

5. An arrangement according to claim 3 characterized by the fact thatthe control devices carry out a single cycle of o erations in responseto each initiation 0 energy transmission from the sending station andreturn to the initial tion of the cycle.

6. In a high-frequency signaling system, a. transmitting station havingmeans for transmitting high-frequency ener and a plurality 0 receivingstations having means for receiving said energy, signaling meansoperated by said receiving means, and rotary synchronous contactorsactuated in re sponse the initial transmission of energy from saidtransmitting station for selectively calling said receiving stations.

7. The combination with a station havin means for transmittinhigh-frequency energy, a plurality of stations having means for positionafter complereceiving said energy, andsignaling means initial position,means for simultaneously settingsaid contactors in rotation in responseto the initial transmission of energy from said transmitting station,said cont-actorssuccessively placing the signaling devices'of theseveral stations in operative condition during diflerent periods of therotation, and means cooperating with the contactor devices in saidtransmitting station for restricting the period ofenergy transmission tothe period of the rotation during which the station that is to be calledis in operative conditlon;

8. An arrangement according to claim 6 characterized by the fact thatthe contactor devices comprise a rotary brush and a plurality ofstationary segments arranged to be successivelyen'aged by said brush inthe course of rotation thereof, the contact seg iment which is inengagement with the brush in the normal rest position being permanent-1y connected to complete the circuit of the transmitting and receivingmeans, when envaged by the brush respectively, the other contactsegments at the transmitting station having means for selectivelycompleting the circuit of said high-frequencg transmitting means, whenengaged byv the l rush and different segments of the cont-actor devicesat the dilferent: receiving. stations being connected to complete thecircuit of the signaling means in the respectivestations when engaged bythe brushes in said stations.

9. The combination according to claim 7 characterized by the fact thatthe contactor devices comprise a rotary brush and a plurality ofstationary segments arranged to be successively engaged by said brush inthe course of rotation thereof, the contact segment which is inengagement with the brush in the normal rest position being permanent 1yconnected to complete theiolrcuit of the transmittin and receiving meanswhen engaged by the brush respectively, the other contact segments atthe transmitting station having means for selectively completing thecircuit of said high-frequency transmitting means, when enga ed by thebrush and different segments 0 the contactor devices at the differentreceiving stations being connected to complete the circuit of thesignaling means in the respective stations when engaged by thebrushes-in said stations.

In testimony whereof I ailix my signature.

HANS KEYL.

